Skip to main content
SpringerLink
Log in

Chromospheric activity associated with moving photospheric magnetic fields

  • Published:
Solar Physics Aims and scope Submit manuscript

Abstract

With the aid of Hα and Ca ii K filtergrams and magnetograms of region McMath 12417 on 3, 4 and 5 July 1973, we have followed the evolution of a moving rim of positive magnetic flux 50″ long in an area dominated by negative flux. Chromospheric activity in the form of brightenings and small surges was associated with this moving flux; a concentration of activity is observed at the locations where magnetic fields of opposite sign meet together. The weakening of the Ca ii K emission along the edges of colliding opposite fields supports evidence from magnetograms that the photospheric magnetic field at that location has decreased strikingly over a period of six hours.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  • Harvey, K. and Harvey, J.: 1973, Solar Phys. 28, 402.

    Google Scholar 

  • Howard, R.: 1959, Astrophys. J. 130, 193.

    Google Scholar 

  • Parker, E. N.: 1963, Astrophys. J. Suppl. 8, 177.

    Google Scholar 

  • Petschek, H. E.: 1964, in W. N. Hess (ed.), AAS-NASA Symposium on the Physics of Solar Flares, NASA SP-50, p. 425.

  • Sheeley, N. R.: 1964, Solar Phys. 9, 347.

    Google Scholar 

  • Smithson, R. C.: 1972, A Videomagnetograph Study of Solar Magnetic Fields in Weak Plage Regions, Ph.D. Dissertation, California Institute of Technology.

  • Smithson, R. C. and Leighton, R. B.: 1971 in R. Howard (ed.) ‘Solar Magnetic Fields’, IAU Symp. 43, 76.

  • Sweet, P.: 1958, in B. Lehnert (ed.) ‘Electromagnetic Phenomena in Cosmical Physics’, IAU Symp. 6, 123.

  • Uchida, Y.: 1969, Publ. Astron. Soc. Japan 21, 128.

    Google Scholar 

  • Vrabec, D.: 1971, in R. Howard (ed.), ‘Solar Magnetic Fields’, IAU Symp. 43, 329.

  • Vrabec, D.: 1974, in R. Grant Athay (ed.), ‘Chrosmospheric Fine Structures’, IAU Symp. 56, in press.

Download references

Author information

Authors and Affiliations

  1. Big Bear Solar Observatory, Hale Observatories, Carnegie Institution of Washington, California Institute of Technology, Pasadena, Calif., U.S.A.

    J. -René Roy & A. G. Michalitsanos

Authors
  1. J. -René Roy
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. A. G. Michalitsanos
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

-René Roy, J., Michalitsanos, A.G. Chromospheric activity associated with moving photospheric magnetic fields. Sol Phys 35, 47–54 (1974). https://doi.org/10.1007/BF00156956

Download citation

  • Received:

  • Revised:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00156956

Keywords

Search

Navigation